ArticlePlant cell reports2025
Overexpression of a novel CC-NBS-LRR gene NtRPP13 confers enhanced resistance to Ralstonia solanacearum in tobacco.
Article in Plant cell reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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9 authors.
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Abstract
key messageNtRPP13, a CNL-type gene suppressed by Ralstonia solanacearum, mediates a positive regulation of hypersensitive response and phytohormone-related defense genes for bacterial wilt resistance in tobacco. Bacterial wilt, caused by Ralstonia solanacearum, is a devastating soil-borne disease that infects hundreds of plant species worldwide. To date, while effective control strategies for this pathogen remain limited, exploring resistant genes is particularly important in disease-resistant breeding. Nucleotide-binding site-leucine-rich repeat (NBS-LRR) proteins are key participants in effector-triggered immunity in plants. This study identified a novel NBS-LRR resistance gene, NtRPP13, in tobacco, which exhibited downregulation in roots of a susceptible tobacco cultivar upon R. solanacearum infection. The NtRPP13 protein contained a typical coiled-coil (CC) domain at its N-terminus and was classified into the CC-NBS-LRR category. Subcellular localization analysis revealed that NtRPP13 localizes to the plasma membrane. Additionally, exposure to phytohormones-including abscisic acid, auxin and gibberellic acid, and abiotic stressors such as drought and cold altered NtRPP13 expression. This could be attribute to the corresponding cis-acting elements in the NtRPP13 promoter. Transient overexpression of NtRPP13 triggered a hypersensitive response (HR) in Nicotiana benthamiana, while stable overexpression in transgenic tobacco plants significantly enhanced resistance to R. solanacearum, with varying resistance levels observed between different transgenic lines. Moreover, following inoculation with R. solanacearum, the transgenic plants exhibited marked upregulation of some key defense-related marker genes associated with the HR, salicylic acid (SA), jasmonic acid (JA), and ethylene signaling pathways, along with significantly elevated levels of JA and SA, compared to wild-type controls. These findings suggest that NtRPP13 contributes to tobacco defense against R. solanacearum by mediating crosstalk between multiple signaling pathways.
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